1 //===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf debug info into asm files.
12 //===----------------------------------------------------------------------===//
14 #ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
15 #define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/MachineLocation.h"
20 #include "llvm/ADT/DenseMap.h"
21 #include "llvm/ADT/FoldingSet.h"
22 #include "llvm/ADT/SmallPtrSet.h"
23 #include "llvm/ADT/StringMap.h"
24 #include "llvm/ADT/UniqueVector.h"
25 #include "llvm/Support/Allocator.h"
30 class DbgConcreteScope;
33 class MachineFrameInfo;
34 class MachineModuleInfo;
46 class DIGlobalVariable;
53 class DICompositeType;
55 //===----------------------------------------------------------------------===//
56 /// SrcLineInfo - This class is used to record source line correspondence.
59 unsigned Line; // Source line number.
60 unsigned Column; // Source column.
61 unsigned SourceID; // Source ID number.
62 MCSymbol *Label; // Label in code ID number.
64 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
65 : Line(L), Column(C), SourceID(S), Label(label) {}
68 unsigned getLine() const { return Line; }
69 unsigned getColumn() const { return Column; }
70 unsigned getSourceID() const { return SourceID; }
71 MCSymbol *getLabel() const { return Label; }
75 /// Asm - Target of Dwarf emission.
78 /// MMI - Collected machine module information.
79 MachineModuleInfo *MMI;
81 //===--------------------------------------------------------------------===//
82 // Attributes used to construct specific Dwarf sections.
86 DenseMap <const MDNode *, CompileUnit *> CUMap;
88 /// AbbreviationsSet - Used to uniquely define abbreviations.
90 FoldingSet<DIEAbbrev> AbbreviationsSet;
92 /// Abbreviations - A list of all the unique abbreviations in use.
94 std::vector<DIEAbbrev *> Abbreviations;
96 /// DirectoryIdMap - Directory name to directory id map.
98 StringMap<unsigned> DirectoryIdMap;
100 /// DirectoryNames - A list of directory names.
101 SmallVector<std::string, 8> DirectoryNames;
103 /// SourceFileIdMap - Source file name to source file id map.
105 StringMap<unsigned> SourceFileIdMap;
107 /// SourceFileNames - A list of source file names.
108 SmallVector<std::string, 8> SourceFileNames;
110 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
111 /// id mapped to a unique id.
112 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
114 /// SourceIds - Reverse map from source id to directory id + file id pair.
116 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
118 /// Lines - List of source line correspondence.
119 std::vector<SrcLineInfo> Lines;
121 /// DIEBlocks - A list of all the DIEBlocks in use.
122 std::vector<DIEBlock *> DIEBlocks;
124 // DIEValueAllocator - All DIEValues are allocated through this allocator.
125 BumpPtrAllocator DIEValueAllocator;
127 /// StringPool - A String->Symbol mapping of strings used by indirect
129 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
130 unsigned NextStringPoolNumber;
132 MCSymbol *getStringPoolEntry(StringRef Str);
134 /// SectionMap - Provides a unique id per text section.
136 UniqueVector<const MCSection*> SectionMap;
138 /// SectionSourceLines - Tracks line numbers per text section.
140 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
142 // CurrentFnDbgScope - Top level scope for the current function.
144 DbgScope *CurrentFnDbgScope;
146 /// DbgScopeMap - Tracks the scopes in the current function. Owns the
147 /// contained DbgScope*s.
149 DenseMap<const MDNode *, DbgScope *> DbgScopeMap;
151 /// ConcreteScopes - Tracks the concrete scopees in the current function.
152 /// These scopes are also included in DbgScopeMap.
153 DenseMap<const MDNode *, DbgScope *> ConcreteScopes;
155 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
156 /// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
157 DenseMap<const MDNode *, DbgScope *> AbstractScopes;
159 /// AbstractSPDies - Collection of abstract subprogram DIEs.
160 DenseMap<const MDNode *, DIE *> AbstractSPDies;
162 /// AbstractScopesList - Tracks abstract scopes constructed while processing
163 /// a function. This list is cleared during endFunction().
164 SmallVector<DbgScope *, 4>AbstractScopesList;
166 /// AbstractVariables - Collection on abstract variables. Owned by the
167 /// DbgScopes in AbstractScopes.
168 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
170 /// DbgVariableToFrameIndexMap - Tracks frame index used to find
171 /// variable's value.
172 DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
174 /// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
175 /// machine instruction.
176 DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
178 /// DbgVariableLabelsMap - Maps DbgVariable to corresponding MCSymbol.
179 DenseMap<const DbgVariable *, const MCSymbol *> DbgVariableLabelsMap;
181 /// DotDebugLocEntry - This struct describes location entries emitted in
182 /// .debug_loc section.
183 typedef struct DotDebugLocEntry {
184 const MCSymbol *Begin;
187 DotDebugLocEntry() : Begin(0), End(0) {}
188 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E,
189 MachineLocation &L) : Begin(B), End(E), Loc(L) {}
190 /// Empty entries are also used as a trigger to emit temp label. Such
191 /// labels are referenced is used to find debug_loc offset for a given DIE.
192 bool isEmpty() { return Begin == 0 && End == 0; }
195 /// DotDebugLocEntries - Collection of DotDebugLocEntry.
196 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
198 /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
199 /// idetifies corresponding .debug_loc entry offset.
200 SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
202 /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
203 /// DbgVariable, if any.
204 DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
206 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
207 /// (at the end of the module) as DW_AT_inline.
208 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
210 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
211 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
212 /// corresponds to the MDNode mapped with the subprogram DIE.
213 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
215 typedef SmallVector<DbgScope *, 2> ScopeVector;
217 SmallPtrSet<const MachineInstr *, 8> InsnsEndScopeSet;
219 /// InlineInfo - Keep track of inlined functions and their location. This
220 /// information is used to populate debug_inlined section.
221 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
222 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
223 SmallVector<const MDNode *, 4> InlinedSPNodes;
225 // ProcessedSPNodes - This is a collection of subprogram MDNodes that
226 // are processed to create DIEs.
227 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
229 /// LabelsBeforeInsn - Maps instruction with label emitted before
231 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
233 /// LabelsAfterInsn - Maps instruction with label emitted after
235 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
237 /// insnNeedsLabel - Collection of instructions that need a label to mark
238 /// a debuggging information entity.
239 SmallPtrSet<const MachineInstr *, 8> InsnNeedsLabel;
241 SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
243 /// Previous instruction's location information. This is used to determine
244 /// label location to indicate scope boundries in dwarf debug info.
245 DebugLoc PrevInstLoc;
248 struct FunctionDebugFrameInfo {
250 std::vector<MachineMove> Moves;
252 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
253 : Number(Num), Moves(M) {}
256 std::vector<FunctionDebugFrameInfo> DebugFrames;
258 // Section Symbols: these are assembler temporary labels that are emitted at
259 // the beginning of each supported dwarf section. These are used to form
260 // section offsets and are created by EmitSectionLabels.
261 MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
262 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
263 MCSymbol *DwarfDebugLocSectionSym;
264 MCSymbol *DwarfDebugLineSectionSym, *CurrentLineSectionSym;
265 MCSymbol *FunctionBeginSym, *FunctionEndSym;
267 DIEInteger *DIEIntegerOne;
270 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
271 /// maps to the source id. Source id starts at 1.
272 std::pair<unsigned, unsigned>
273 getSourceDirectoryAndFileIds(unsigned SId) const {
274 return SourceIds[SId-1];
277 /// getNumSourceDirectories - Return the number of source directories in the
279 unsigned getNumSourceDirectories() const {
280 return DirectoryNames.size();
283 /// getSourceDirectoryName - Return the name of the directory corresponding
285 const std::string &getSourceDirectoryName(unsigned Id) const {
286 return DirectoryNames[Id - 1];
289 /// getSourceFileName - Return the name of the source file corresponding
291 const std::string &getSourceFileName(unsigned Id) const {
292 return SourceFileNames[Id - 1];
295 /// getNumSourceIds - Return the number of unique source ids.
296 unsigned getNumSourceIds() const {
297 return SourceIds.size();
300 /// assignAbbrevNumber - Define a unique number for the abbreviation.
302 void assignAbbrevNumber(DIEAbbrev &Abbrev);
304 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
305 /// information entry.
306 DIEEntry *createDIEEntry(DIE *Entry);
308 /// addUInt - Add an unsigned integer attribute data and value.
310 void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
312 /// addSInt - Add an signed integer attribute data and value.
314 void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
316 /// addString - Add a string attribute data and value.
318 void addString(DIE *Die, unsigned Attribute, unsigned Form,
319 const StringRef Str);
321 /// addLabel - Add a Dwarf label attribute data and value.
323 void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
324 const MCSymbol *Label);
326 /// addDelta - Add a label delta attribute data and value.
328 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
329 const MCSymbol *Hi, const MCSymbol *Lo);
331 /// addDIEEntry - Add a DIE attribute data and value.
333 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry);
335 /// addBlock - Add block data.
337 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
339 /// addSourceLine - Add location information to specified debug information
341 void addSourceLine(DIE *Die, const DIVariable V);
342 void addSourceLine(DIE *Die, const DIGlobalVariable G);
343 void addSourceLine(DIE *Die, const DISubprogram SP);
344 void addSourceLine(DIE *Die, const DIType Ty);
345 void addSourceLine(DIE *Die, const DINameSpace NS);
347 /// addAddress - Add an address attribute to a die based on the location
349 void addAddress(DIE *Die, unsigned Attribute,
350 const MachineLocation &Location);
352 /// addRegisterAddress - Add register location entry in variable DIE.
353 bool addRegisterAddress(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
355 /// addConstantValue - Add constant value entry in variable DIE.
356 bool addConstantValue(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
358 /// addConstantFPValue - Add constant value entry in variable DIE.
359 bool addConstantFPValue(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
361 /// addComplexAddress - Start with the address based on the location provided,
362 /// and generate the DWARF information necessary to find the actual variable
363 /// (navigating the extra location information encoded in the type) based on
364 /// the starting location. Add the DWARF information to the die.
366 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
367 const MachineLocation &Location);
369 // FIXME: Should be reformulated in terms of addComplexAddress.
370 /// addBlockByrefAddress - Start with the address based on the location
371 /// provided, and generate the DWARF information necessary to find the
372 /// actual Block variable (navigating the Block struct) based on the
373 /// starting location. Add the DWARF information to the die. Obsolete,
374 /// please use addComplexAddress instead.
376 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
377 const MachineLocation &Location);
379 /// addVariableAddress - Add DW_AT_location attribute for a DbgVariable.
380 void addVariableAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
381 const MachineLocation &Location);
383 /// addToContextOwner - Add Die into the list of its context owner's children.
384 void addToContextOwner(DIE *Die, DIDescriptor Context);
386 /// addType - Add a new type attribute to the specified entity.
387 void addType(DIE *Entity, DIType Ty);
390 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
391 DIE *getOrCreateNameSpace(DINameSpace NS);
393 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
395 DIE *getOrCreateTypeDIE(DIType Ty);
397 void addPubTypes(DISubprogram SP);
399 /// constructTypeDIE - Construct basic type die from DIBasicType.
400 void constructTypeDIE(DIE &Buffer,
403 /// constructTypeDIE - Construct derived type die from DIDerivedType.
404 void constructTypeDIE(DIE &Buffer,
407 /// constructTypeDIE - Construct type DIE from DICompositeType.
408 void constructTypeDIE(DIE &Buffer,
409 DICompositeType CTy);
411 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
412 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
414 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
415 void constructArrayTypeDIE(DIE &Buffer,
416 DICompositeType *CTy);
418 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
419 DIE *constructEnumTypeDIE(DIEnumerator ETy);
421 /// createGlobalVariableDIE - Create new DIE using GV.
422 DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
424 /// createMemberDIE - Create new member DIE.
425 DIE *createMemberDIE(const DIDerivedType &DT);
427 /// createSubprogramDIE - Create new DIE using SP.
428 DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
430 /// getOrCreateDbgScope - Create DbgScope for the scope.
431 DbgScope *getOrCreateDbgScope(const MDNode *Scope, const MDNode *InlinedAt);
433 DbgScope *getOrCreateAbstractScope(const MDNode *N);
435 /// findAbstractVariable - Find abstract variable associated with Var.
436 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
438 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
439 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
440 /// If there are global variables in this scope then create and insert
441 /// DIEs for these variables.
442 DIE *updateSubprogramScopeDIE(const MDNode *SPNode);
444 /// constructLexicalScope - Construct new DW_TAG_lexical_block
445 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
446 DIE *constructLexicalScopeDIE(DbgScope *Scope);
448 /// constructInlinedScopeDIE - This scope represents inlined body of
449 /// a function. Construct DIE to represent this concrete inlined copy
451 DIE *constructInlinedScopeDIE(DbgScope *Scope);
453 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
454 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
456 /// constructScopeDIE - Construct a DIE for this scope.
457 DIE *constructScopeDIE(DbgScope *Scope);
459 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
460 /// the start of each one.
461 void EmitSectionLabels();
463 /// emitDIE - Recusively Emits a debug information entry.
465 void emitDIE(DIE *Die);
467 /// computeSizeAndOffset - Compute the size and offset of a DIE.
469 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
471 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
473 void computeSizeAndOffsets();
475 /// EmitDebugInfo - Emit the debug info section.
477 void emitDebugInfo();
479 /// emitAbbreviations - Emit the abbreviation section.
481 void emitAbbreviations() const;
483 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
486 void emitEndOfLineMatrix(unsigned SectionEnd);
488 /// emitDebugLines - Emit source line information.
490 void emitDebugLines();
492 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
494 void emitCommonDebugFrame();
496 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
498 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
500 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
502 void emitDebugPubNames();
504 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
506 void emitDebugPubTypes();
508 /// emitDebugStr - Emit visible names into a debug str section.
512 /// emitDebugLoc - Emit visible names into a debug loc section.
516 /// EmitDebugARanges - Emit visible names into a debug aranges section.
518 void EmitDebugARanges();
520 /// emitDebugRanges - Emit visible names into a debug ranges section.
522 void emitDebugRanges();
524 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
526 void emitDebugMacInfo();
528 /// emitDebugInlineInfo - Emit inline info using following format.
530 /// 1. length of section
531 /// 2. Dwarf version number
534 /// Entries (one "entry" for each function that was inlined):
536 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
537 /// otherwise offset into __debug_str for regular function name.
538 /// 2. offset into __debug_str section for regular function name.
539 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
540 /// instances for the function.
542 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
543 /// inlined instance; the die_offset points to the inlined_subroutine die in
544 /// the __debug_info section, and the low_pc is the starting address for the
545 /// inlining instance.
546 void emitDebugInlineInfo();
548 /// GetOrCreateSourceID - Look up the source id with the given directory and
549 /// source file names. If none currently exists, create a new id and insert it
550 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
552 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
554 /// constructCompileUnit - Create new CompileUnit for the given
555 /// metadata node with tag DW_TAG_compile_unit.
556 void constructCompileUnit(const MDNode *N);
558 /// getCompielUnit - Get CompileUnit DIE.
559 CompileUnit *getCompileUnit(const MDNode *N) const;
561 /// constructGlobalVariableDIE - Construct global variable DIE.
562 void constructGlobalVariableDIE(const MDNode *N);
564 /// construct SubprogramDIE - Construct subprogram DIE.
565 void constructSubprogramDIE(const MDNode *N);
567 /// recordSourceLine - Register a source line with debug info. Returns the
568 /// unique label that was emitted and which provides correspondence to
569 /// the source line list.
570 MCSymbol *recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope);
572 /// getSourceLineCount - Return the number of source lines in the debug
574 unsigned getSourceLineCount() const {
578 /// recordVariableFrameIndex - Record a variable's index.
579 void recordVariableFrameIndex(const DbgVariable *V, int Index);
581 /// findVariableFrameIndex - Return true if frame index for the variable
582 /// is found. Update FI to hold value of the index.
583 bool findVariableFrameIndex(const DbgVariable *V, int *FI);
585 /// findVariableLabel - Find MCSymbol for the variable.
586 const MCSymbol *findVariableLabel(const DbgVariable *V);
588 /// findDbgScope - Find DbgScope for the debug loc attached with an
590 DbgScope *findDbgScope(const MachineInstr *MI);
592 /// identifyScopeMarkers() - Indentify instructions that are marking
593 /// beginning of or end of a scope.
594 void identifyScopeMarkers();
596 /// extractScopeInformation - Scan machine instructions in this function
597 /// and collect DbgScopes. Return true, if atleast one scope was found.
598 bool extractScopeInformation();
600 /// collectVariableInfo - Populate DbgScope entries with variables' info.
601 void collectVariableInfo(const MachineFunction *,
602 SmallPtrSet<const MDNode *, 16> &ProcessedVars);
604 /// collectVariableInfoFromMMITable - Collect variable information from
605 /// side table maintained by MMI.
606 void collectVariableInfoFromMMITable(const MachineFunction * MF,
607 SmallPtrSet<const MDNode *, 16> &P);
609 //===--------------------------------------------------------------------===//
610 // Main entry points.
612 DwarfDebug(AsmPrinter *A, Module *M);
615 /// beginModule - Emit all Dwarf sections that should come prior to the
617 void beginModule(Module *M);
619 /// endModule - Emit all Dwarf sections that should come after the content.
623 /// beginFunction - Gather pre-function debug information. Assumes being
624 /// emitted immediately after the function entry point.
625 void beginFunction(const MachineFunction *MF);
627 /// endFunction - Gather and emit post-function debug information.
629 void endFunction(const MachineFunction *MF);
631 /// getLabelBeforeInsn - Return Label preceding the instruction.
632 const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
634 /// getLabelAfterInsn - Return Label immediately following the instruction.
635 const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
637 /// beginScope - Process beginning of a scope.
638 void beginScope(const MachineInstr *MI);
640 /// endScope - Prcess end of a scope.
641 void endScope(const MachineInstr *MI);
643 } // End of namespace llvm